s1 = "aabcc"
s2 = "dbbca"
s3 = "aadbbcbcac"
def isInterleave(s1, s2, s3):

    s3LeftPointer,s3RightPointer=0,0
    s1LeftPointer,s1RightPointer=0,0
    s2LeftPointer,s2RightPointer=0,0

    while s3LeftPointer<len(s3) and  s1LeftPointer<len(s1):
        if s3[s3RightPointer]==s1[s1RightPointer]:
            pass


